<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    var socket;
    // 判断 当前 浏览器 是否支持 WebSocket 编程
    if (window.WebSocket) {
        // go on
        socket = new WebSocket("ws://localhost:7000/hello");

        // 相当于 ChannelRead0，ev 收到服务器端的消息
        socket.onmessage = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + ev.data
        };

        // 相当于 连接开启
        socket.onopen = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = "连接开启了...."
        };

        // 相当于 连接关闭
        socket.onclose = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + "连接关闭了..."
        }


    } else
        alert("当前浏览器不支持 WebSocket 编程..");


    // 发送消息到服务器
    function send(message) {
        if (!window.socket) // 判断 WebSocket 是否创建好
            return;
        if (socket.readyState === WebSocket.OPEN)
            // 发送消息
            socket.send(message);
        else
            alert("连接 没有开启")

    }

</script>

<form onsubmit="return false">
    <textarea name="message" style="height: 300px;width: 300px"></textarea>
    <input type="button" value="发送消息" onclick="send(this.form.message.value)"/>
    <textarea id="responseText" style="height: 300px;width: 300px"></textarea>
    <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''"/>
</form>
</body>
</html>